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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4335186ef75aa6ebe51d39b217874d668af845fd5f7eb9814cc5af0c3ae491be' 
  AND token = 'OVzSywj46ein48ZbP7m98EhDC/7Wg/bcaymPNWxtHdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}